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Replacement for Harley-Davidson O-rings part #11105 for Oil, Transmission and Primary "Drain Plugs" These are Viton O-rings. You will receive 50 pcs. They are used on Twin Cam engine oil, transmission and primary drain plugs on most late model Harley's. They resist chemicals and oil better than the cheaper Buna-N O-rings being sold. First Class shipping in a padded mailer with a tracking #, NOT a letter envelope without tracking. Check your manual to be sure H-D replacement part #11105 is what you use.